NF: Command line interface to QuickBundles.
BF: Make sure that dipy_quickbundles gets installed.
RF: More fixes.
RF: More work to get it to be compatible with vistasoft conventions.
RF: Improvements: cluster colors, pickle-saving.
BF: Save .trk file header. Don't error every time, when using .trk files.
TST: Testing the QB script.
RF + TST: Use save_pickle and test it.
TST: dipy_quickbundles requires mpl.
TST + RF: Added an option to specify the output path. Added MPL to Travis.
RF: Clean out some cruft.
Also save centroids as output.
Reduce dependency and make documentation more 'canonical'.
Merge pull request #260 from arokem/qb-commandline

NF: Command line interface to QuickBundles.